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Prevalence and complications of asymptomatic postpartum urinary retention

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The prevalence, complications and natural course of asymptomatic postpartum urinary retention, i.e. a post void residual volume >= 150 ml after spontaneous micturition.

Study design

An observational prospective cohort study

Study population

Women who deliver vaginally in the participating hospitals of 18 years and older and have spontaneous micturition


The volume of the first void after the delivery is measured in all women who deliver in the participating hospitals. After this, a non invasive abdominal bladderscan to measure the post void residual bladder volume (PVRV) will be done. Patients with an abnormal PVRV (>= 150 ml) are asked to participate in the study; the natural course of asymptomatic postpartum urinary retention is followed by bladderscans. Patients with a normal PVRV are asked to participate in the control group.


Outcome measures


Primary Objective:

micturition related quality of life after 3 months in women with asymptomatic postpartum urinary retention in a prospective cohort.


Secondary Objectives:

- Prevalence of asymptomatic postpartum urinary retention.

- Prevalence of urinary tract morbidity and care consumption in patients with asymptomatic postpartum urinary retention.

- Identification of prognostic factors for asymptomatic postpartum urinary retention.

- Costs related to asymptomatic abnormal post void residual volume.

Power/data analysis

A difference of 8 points at the total score of the UDI-6 is considered to be clinically relevant. A standard deviation of 16 points is assumed to realize an effect-size of 0.5.  To achieve a power of 90% for detecting a significant difference, alpha of 0.05, a total of 86 patients with asymptomatic urinary retention is needed when performing a 2-sided unpaired T-Test. Anticipating a drop-out of about 15%, we want to include 100 patients.

Time schedule
18 Months. Three months of preparation, twelve months inclusion, three months analysis and report.

Dr. J.P.W.R. Roovers, gynaecologist, AMC

Prof. B.W. Mol, gynaecologist AMC

Drs. F.E.M. Mulder, research physician


Drs. F.E.M. Mulder, research physician
AMC Amsterdam
pager 59533 (AMC: 020-5669111)

email: compare@studies-obsgyn.nl